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Stan_Ham diode driver (analog)

Some time ago i was looking for a simple driver for analog modulation of cheap opencan reds and bleurays.
Rob stanwax emailed me with a driverschematic of his dualdriver he was using in his small projector.
with some help of Rob (Laserwave.co.uk) i modified the driver and made a single anolog board out of it.

We know its nice when people help each other.
So here's the schematic and PCB for you all to expiriment with.

If you need to ask the question 'whats so good about a laser' - you won't understand the answer.
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Laserists do it by the nanometre.

Could you by any chance post the board for the dual driver setup? As I'd be looking to buy/build two of the dual driver setups for some blu and red diodes.

Excuse my ignorance on this, but am I right in thinking these replace the current sources for the drivers of the diodes, and swap them directly with this circuit?

Also, am I right in thinking the diode would connect in the top right (at least for the single diode version), the +/- 6V on the left, and a connection to the FB3 on the SINGLEMOD point?
What do the Monitor points do? And what do the pots do?

Is this basically like the LavaDrive1 circuit? (or whatever it's called!)

Rob, do you have any of the dual diode boards, blank or completed PCB's made up to buy? No worries if not, I'll route one out myself, but it would save me a few hours.

Laser (the acronym derived from Light Amplification by Stimulated Emissions of Radiation) is a spectacular manifestation of this process. It is a source which emits a kind of light of unrivaled purity and intensity not found in any of the previously known sources of radiation. - Lasers & Non-Linear Optics, B.B. Laud.

Yes they will work exactly as you suggest. The monitor points are so you can see the diode current and... well.... monitor it With a 1R resitor the volts (or more accurately millivots) acrsoo the resitor will indicate the mA through the diode. The pots are for threshold and max diode current so you set the driver to keep the diode current dribbling just on the point of lasing. Then as the input increases you have maximum range between 0 and 5v on the modulation. The limitation of the board is based on the output transitor (in combination with the monitor resistor (R9) and the supply volts. I run this circuit in my RGB and the output transistor is a BC337 (good for 800mA) which is neatly in a to92 and does not need heatsinking for a single diode drive.
Yes I will be able to sort you either a pcb or a complete built board of the dual driver - this is actually as it first went to Anthony, he just trimmed one circuit out.

Rob

PS sorry i missed you yesterday give me a try this aft I will have my phone with me today

If you need to ask the question 'whats so good about a laser' - you won't understand the answer.
-----------------------------------------------------------------------------------------------
Laserists do it by the nanometre.

Yes I will be able to sort you either a pcb or a complete built board of the dual driver - this is actually as it first went to Anthony, he just trimmed one circuit out.

I have replaced the BC337 for a BD437 that could be cooled better with a heatsink because i wanted te run a 500 mW 808 pump diode.
The bleuray diode at 60mw doesn't even get warm :-)
I added some small things and use different pots

The dual driver from Rob is a nice small board.. good layout and works great.. just watch his youtube videos.

my first TEST board without powerled and with the bc337.
different PCB routing.

There is NON...
not everybody has the knowlegde like you....
feel free to improve the schematic and board.

its a PL project.
But keep in mind that is has to be obtainable for evrybody (no SMD and exotic EU or USA electronics)
Someone with basic electronics skills must be able to make te board.
Maybe in the future put in a lasorb.